Global Patent Index - EP 0995216 A1

EP 0995216 A1 2000-04-26 - CATHODE RAY TUBE COMPRISING AN ELECTRON GUN

Title (en)

CATHODE RAY TUBE COMPRISING AN ELECTRON GUN

Title (de)

KATHODENSTRAHLRÖHRE MIT EINER ELEKTRONENKANONE

Title (fr)

TUBE A RAYONS CATHODIQUES EQUIPE D'UN CANON A ELECTRONS

Publication

EP 0995216 A1 (EN)

Application

EP 99914704 A

Priority

  • EP 99914704 A
  • EP 98201524 A
  • IB 9900772 W

Abstract (en)

[origin: WO9959181A1] A cathode ray tube comprises an electron gun with means for generating electron beams. External magnetic fields influence the electron beams and reduce the picture quality. An electrode of the gun includes a part made of a soft-magnetic material, which extends transversely to the electron beams, and two parts, situated to the left and to the right of the electron beams, which extend along said electron beams. Together these parts form a magnetic circuit. Preferably, these parts are strongly magnetically coupled, for example, because they are interconnected or very closely spaced. Interaction of the magnetic circuit formed by said three parts with an external magnetic field causes a Lorentz force on the electron beams. The resultant deviations in the paths of the electron beams largely compensate for the deviations in the paths of the electron beams caused by the effect of the external magnetic field between the electron gun and the display screen.

IPC 1-7 (main, further and additional classification)

H01J 29/50

IPC 8 full level (invention and additional information)

H01J 29/50 (2006.01); H01J 29/48 (2006.01)

CPC (invention and additional information)

H01J 29/484 (2013.01)

Citation (search report)

See references of WO 9959181A1

Designated contracting state (EPC)

DE FR GB NL

DOCDB simple family

WO 9959181 A1 19991118; DE 69910938 D1 20031009; DE 69910938 T2 20040715; EP 0995216 A1 20000426; EP 0995216 B1 20030903; JP 2002515633 A 20020528; TW 392190 B 20000601; US 6239542 B1 20010529